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You searched for: mediatype:texts AND collection:carnegieinstitution AND subject:"Earth Currents"
[texts]Earth-current results at Tucson Magnetic Observatory, 1932-1942 - Carnegie Institution of Washington. Dept. of Terrestrial Magnetism; Rooney, W. J.
Carnegie Institution of Washington publication 175, vol. IX"Researches of the Department of Terrestrial Magnetism, vol. IX"
Keywords: Geomagnetism--Arizona--Tucson--Observations; Earth currents
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